Electric surfacing tool



March 28, 1939. w HOLT 2,152,352

ELECTRIC SURFACING TOOL Filed Oct. 19, 1957 2 Sheets-Sheet l 1N VENT OR.

William E Hall? ATTORNEY.

March 28, 1939. w. E. HOLT 5 ,35

ELECTRIC SURFACING TOOL Filed Oct. 19, 1937 2 Sheets-Sheet 2 INVENTOR.

Mal/m EEO/Z5 Patented 19 39 meme suaracnsd 'roor.

wuusn anon, Llvingston NJ. Application mm 19. 1937. sci-m u 10am w y a cum (CL 51-170) minvention relates: to the construction of I portable electric surfacing tools capable of high speed sanding and finishing operations on metal.

- stone and wood surfaces of all'types.

I The mainobiect of my invention is the provision of a-tool of the character described havin an improved construction and arrangement of its parts, and more particularly, of a dust collection'and disposal system for such a larity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, its operating, advantages and specific objects attained by its use, reference should be had to the accompanying drawlugs and descriptive matter in which I have illus- 'trated and described a preferred embodiment of'myinvention. 0f the drawings: v Fig.1 is an elevation of a surfacing tool con structed in accordance with my invention;

Fig. 2 is a similar elevation with some of the parts broken awayand' in acetic Fig. 3 is a bottom view; and 3 Fig. 4 is an end view of'the tool shown in Fig. 1. In the surfacing tool illustrated, a sectional housing It has a horizontally'elongatedmain section Ii. enclosing a high speed electric motor 30 II, the armature shaft I! of which is arranged to rotate about a horizontal axis. The housing section II has a flange connection at its front end to a rounded end section l4 into which projacts the corresponding end of the armature shaft.

I The housing section l4 also encloses gears II, I.

forming a driving connection between one end of the shaft l3 and a vertical spindle II, the lower portion .of whichprojects through a dust sealedv hearing I! closing the bottom of the section i4. 4 A flexible felt and metal pad 59 is'detachably mounted on the spindieto form a cushioning layer for an abrasive disc fl held against its lower face. I In operations considerable amount of dust is generated by the action of the abrasive disc on the surface undergoing treatment, and it ishighly desirable that this be efllciently withdrawn from the surfacing zone and collected, not only from a health standpoint but also to avoid its deposition in the motor through the ventilating openings II in the housing section II. For this purpose-a frusto-conical dust hood I! is detachably connected to the underside of the housing section 14 with its lower edge located'slightly above the 65 plane of the abrasive disc II and an arcuate The various features of novelty which characterlze my invention are pointed out with particushaft I! in the fan chamber.

' speed surfacing tool which is of light weight comportion cut away along its lower front edge to.

P rmit tilting of the surfacing element. A fiexibie dust seal is provided between the surface being treatedand the lower edge of the hood 25 over most of its circumference by arow of bristles 24 5 held in position on the hood by a band 21.

The rear side of the hood 2! is formed with a 'dust. outlet 24 opening into a horizontally elongated dust conduit 2! of rectangular cross-section integrally formed" with the hood and extending 10 horizontally belowthe housing section II to a point beyond the rear end of the motor. On the rear end of the conduit .28 is a circular extension 30 which is utilized as a fan chamber 3|. The chamber Si is separated from the space occupied 15 by the motor. by its vertical front wall 32 detachably connected to a dust sealed bearing 33 closing the rear end of the housing section I I, the

rear end of the armature shaft i3 extending through the bearing 83 and wall 32 into the fan chamber. An exhaust fan 34 is mounted on the Communication between the rear end, of the conduit 29 and the rear side of the fan chamber is maintained by a hollow closure section 31. The dust-laden air withdrawn from the hood 2! through the conduit 29 by the .fan I4 is discharged from the fan chamber through a top outlet 38, to which a dust bag I! is normally tied, as indicated in Fig. 1.

The power supply line to the motor includes a .pair of leads 40 connected to a switch box 4| in a pocket 43 on the rear end of the closure member 31., Electricpower is supplied to the switch. box 4| through a conductor cable 44 extending through a handle 45 on the rear end of the tool. 5

] An additional handle 44 canbe secured to either side of the housing section I4 for the other hand of the operator.

The described construction provides a high protection for the parts requiring protection 59 from abrasive dust and dirt, as well as eliminating a serious nuisance to the operator. 7

While in accordance with the provisions of the statutes 1 have illustratedand described herein the best form of my invention now known to me,

changes may be made in the form of the appsratus disclosed without departing from the spirit of the invention covered by my claims, and that certain features of my invention may sometimes be used to advantage without a corres onding use of other features.

I claim:

1. A portable surfacing tool comprising an electrlc motor having a horizontally arranged armature shaft, a vertical spindle at one end of said armature shaft and having a surfacing element 'on its lower end, and gearing operatively connecting said armature shaft and spindle, a dust hood surrounding said surfacing element, a fan chamber at the opposite end of said armature shaft, an exhaust fan in said chamber, and a dust conduit extending below said motor and connecting said dust hood and fan chamber.

2- A portable surfacing tool-comprising a housing enclosing an electric motorhaving a horizontally arranged armature shaft, a vertical spindle at one end of said armature shaft and having a horizontally rotatable surfacing element on its lower end, and gearing operatively connectingsaid armature shaft and spindle, a 'dust hood at one end of said housing and surrounding said surfacing element, a fan chamber at the opposite end of said armature shaft, an exhaust fan in said chamber mounted on said armature shaft opposite end, and a dust conduit extending below said motor and connecting said dust hood and fan chamber.

3. A portable surfacing tool comprising a housing enclosing an electric motor having a horizontally arranged armature shaft, a vertical spindle at one end of said armature shaft and having a horizontally rotatable surfacing element on its lower end, and gearing operatively connecting saidarmature shaft and spindle, a circular dust hood at one end of said housing and surrounding said surfacing element, a fan chamber enclosing the opposite end of said armature shaft,

an exhaust fan in said chamber mounted on said armature shaft opposite end, and a horizontally. arranged dust conduit extending below said motor and connecting said dust hood and fan chamber, said dust hood and conduit being detach ably connected to said housing.

1. A portable surfacing tool comprising a hous ing enclosing an electric motor having a horizontally arranged armature shaft, a vertical spindleat one end of said armature shaft and hava,1sa,ssa those skilled in the art will understand .that

switch box mounted adjacent said-fan chamber,

and handles mounted onv said switch box and the opposite .end of said housing for manipulating said tool.

5. A portable surfacing tool comprising a housing enclosing an electric motor having a horizontally arranged armature shaft, a vertical spindle at one end of said armature shaft and having a horizontally rotatable surfacing element on its lower end, and searing operatively connecting said armature shaft and spindle, a circular dust hood at one end of said housing andsurrounding said surfacing element, a fan cham-, her at the opposite end of said armature shaft, an exhaust fan in said chambermounted on said armature shaft opposite end, a horizontally-arranged dust conduit extending below .saidhousing and connecting said dust hood and fan chamher, a switch box mounted adjacent said fan chamber, and handles mounted on said switch box and the opposite end of said housing for manipulating said tool.

6. A portable surfacing tool comprising a housing enclosing an electric motor having a" horizontally arranged armature shaft, a vertical spindle. at one end of said armature shaft and having a horizontally rotatable surfacing element on its lower end, and gearing operatively connecting said armature shaft and spindle, a circular dust hood detachably connected-to the under side of one end of'said housing and surrounding said surfacing element,said dust hood having an integral conduit extension arranged below said motor, a fan chamber above the end of said conduitextension, an exhaust-fan in said fan chamber mounted on the opposite end of said armature shaft, an end closure member connecting said,

dust hood conduit extension and said fanchamber, a dust outlet at the upper end of said fan chamber, a dust bag connected to said outlet. and handles mounted on said closure member and the opposite end offlsaid housing for manipulat-" ing said tool.

. WILLIAM E. HOLT. 

